Active Air-Timer Options:Hydrofarm CO2 (1-20 cu ft per hour) with Timer You can use enzymes to

You can use enzymes to flush or add them to the nutrient solution throughout the grow cycle

to automatic

The Uvonair attacks and neutralizes odors at the source

Comes in a heavy-duty

waterproof casing

Active Air-Timer Options:Hydrofarm CO2 (1-20 cu ft per hour) with Timer You can use enzymes toDeliver growth boosting CO2 with our user friendly, easy to operate system. With its programmable timer, it will automatically maintain ideal CO2 levels for optimum growth. For small to medium size areas, select the COSYS; for larger than 10' x 10' areas, select the COSYS20. To use Hydrofarm's CO2 Flow Rate Calculator, click HERE NOTE: Current COSYS & COSYS20 now come equipped with a black rubber O ring that has replaced the white plastic washer.